Fig 6.

Maximum likelihood tree based on 16S rRNA sequences, which shows the phylogenetic affiliation of the Micavibrio-like bacteria detected in this study (in boldface). Strains which are known predators are marked by an asterisk. Sequences retrieved from WWTPs in other studies are marked by “WWTP.” Solid circles on tree nodes indicate >90% and open circles >70% maximum likelihood bootstrap support (1,000 iterations). Representative beta- and gammaproteobacteria were used as outgroups. The scale bar indicates 0.1 estimated change per nucleotide.